From 4516ba7004bfb06468a56636d2e170aaaa82c27a Mon Sep 17 00:00:00 2001
From: csmoe <35686186+csmoe@users.noreply.github.com>
Date: Sun, 23 Sep 2018 22:58:47 +0800
Subject: [PATCH 1/2] deny overflow literals

---
 src/librustc_lint/types.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/librustc_lint/types.rs b/src/librustc_lint/types.rs
index 2bec9203e9ee5..01d4d0f8cdb67 100644
--- a/src/librustc_lint/types.rs
+++ b/src/librustc_lint/types.rs
@@ -24,6 +24,7 @@ use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64};
 use syntax::{ast, attr};
 use syntax::errors::Applicability;
 use rustc_target::spec::abi::Abi;
+use syntax::edition::Edition;
 use syntax_pos::Span;
 use syntax::source_map;
 
@@ -38,7 +39,8 @@ declare_lint! {
 declare_lint! {
     OVERFLOWING_LITERALS,
     Warn,
-    "literal out of range for its type"
+    "literal out of range for its type",
+    Edition::Edition2018 => Deny
 }
 
 declare_lint! {

From 6523eabf6e013f2889ed8af60ab6019690f6b00b Mon Sep 17 00:00:00 2001
From: csmoe <35686186+csmoe@users.noreply.github.com>
Date: Sun, 23 Sep 2018 22:59:06 +0800
Subject: [PATCH 2/2] add test for edition 2018

---
 .../edition-deny-overflowing-literals-2018.rs    | 16 ++++++++++++++++
 ...edition-deny-overflowing-literals-2018.stderr | 10 ++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/test/ui/editions/edition-deny-overflowing-literals-2018.rs
 create mode 100644 src/test/ui/editions/edition-deny-overflowing-literals-2018.stderr

diff --git a/src/test/ui/editions/edition-deny-overflowing-literals-2018.rs b/src/test/ui/editions/edition-deny-overflowing-literals-2018.rs
new file mode 100644
index 0000000000000..48dfd24d50d48
--- /dev/null
+++ b/src/test/ui/editions/edition-deny-overflowing-literals-2018.rs
@@ -0,0 +1,16 @@
+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// edition:2018
+
+fn main() {
+    let x: u8 = 256;
+    //~^ error: literal out of range for u8
+}
diff --git a/src/test/ui/editions/edition-deny-overflowing-literals-2018.stderr b/src/test/ui/editions/edition-deny-overflowing-literals-2018.stderr
new file mode 100644
index 0000000000000..97f547abfa703
--- /dev/null
+++ b/src/test/ui/editions/edition-deny-overflowing-literals-2018.stderr
@@ -0,0 +1,10 @@
+error: literal out of range for u8
+  --> $DIR/edition-deny-overflowing-literals-2018.rs:14:17
+   |
+LL |     let x: u8 = 256;
+   |                 ^^^
+   |
+   = note: #[deny(overflowing_literals)] on by default
+
+error: aborting due to previous error
+